Telegraph-transmitter.



J. A. 00X & J. H. KID'WBLL.

TELEGRAPETRANBMITTER.

APPLIUATION FILED s221227. 1910.

Patented Mar. 12,1912.

lnventOlS Attorneys ASI'ON A. COX AND .TEW E.. IDWELL, 0F PARKERSBUBG,

QOX ABBIGNOB TO SAID KIDWELI.

Uinrnn STATES .PATENT oFFicE.

J l L. WEST VIRGINIA.; SAID TELEGwH-TBANBMITTER Speoicetl'on o! LettersPatent.

ITo all wwm t may concern.'

Be vit known that we, JOHN A. Cox and J EREMIAH H. K mwnm., citizens ofthe- United States, residing at Parkersburg, 1n the count of Wood, Stateof fWest. Virginia, have invented a new and useful Telegraph-Transmitter, of which the following is a specification.

It is the 4object of this invention tolprovide a tele aph transmitter soconstituted that. when t e same is operated to produce a dot, there willbe no buzzing sound attendant upon the productionof the dot, the effectknown as a s lit-dot being avoided.

Another object o the invention is to provide means for adjusting thebase-carried contact point, with respect to the contact point of the keylever.

With the foregoing and other objects in view which vwill appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed andclaimed, it being understood that changes in the preciseembodiment of iiivention herein disclosed can be made within the scopeof what is claimed without departin lfrom the spirit of the invention.

n the drawings,-Figure 1 is a top plan; Fig. 2 is a section upon' theline 2-2 of Fig. l; and Fig. 3 is a section on the line 3-3 of Fig. 1.Fig. 4 is a section online 4-4 of Fig.- 1.

In carrying out -the invention there is provided, as a primary. andfundamental element, a base 1, ordinarily fashioned from Ainsulatingmaterial. Mounted u on the base 1, relatively near to one end t ereof,is a lower block 4, upon which is superposed an upperA block '3, theblocks 4 and 3 being. united with each other, and with the base 1,

by means of screws 2 or 4other securing elements 'adapted to a like end.The lower face of the upper block 3 is recessed, as shown at 5, theupper face of the lower block' being similarly recessed, as Ishown at 6,thus de lining an opening 7 through the blocks.l

The key lever is a composite. structure, comprising spaced bars 22 and45,1connected by a spring strip 8, the key lever including a movable end17 pivoted as shown at 44, to

the portion 45 o the key lever, the end 17 of the key lever beingknuokled against the bar 45, so that the movable end 17 may be swung inthe direction of the arrow Y, the

niovable end, Vhow-ever when swung in,` the direction of the arrow X,bein held in alinement with the bar 45 of the ey lever.

At its extremity, tlie movable end 17 of the,

keylever carries a finger-piece 18,-ordinarily4 fashioned frominsulating material.

The key lever, constructed as above described, is inserted through theopening 7- in the blocks 4 and 3, the key lever 'being held in place formovement in a Iplane parallel to the base 1 by means of screws 11 l and12,the screw 11 passing downwardly through' the block 3, the screw 12passing upwardly through the base 1` and through the block 4, bothscrews engaging the conical ends 10 of a bearing 9, formed upon theportion 45 of the key lever. The base 1 is recessed,as

shown at 14, to receive the head 13 of theA screw 12.

Slidably mounted upon the portion 22 of the key lever, is a weight 23,held in ad.

Patented' Mar. '12, 1912.

justed positions b means. of a set screw 24.

.Slidably mounte upon the portion 22 of the key lever, between theweight 23 and the springv 8, is a collar 25, held in place by a setscrew 26. One arm of a -Ushaped spring 27 is slidable in the collar 25,for'movement parallel to the portion 22 of the key lever, the spring 27being held in place by a set screw 28, inserted into one side of thecollar 25. The free end 29 of the spring 27 carries upon its outer facea contact, ordinaril of to platinum. vThis contact 30 is -adapte engagea contact 31 carried by' a U-shaped spring 32, the cross sectional areaof the contact,.30, being relatively small, compared with the crosssectional area of the' contact 31, whereby the relative positions of thesprings '27 and 32 may be adj-usted, without causing the contact 30 toprotrude beyond the eriphery of the contact 31. That end of t e spring32 which is remote fron'i` the contact 31, is provided with anenlargement 33 slidably mounted in, and conforming to, an undercutrecess 34 in an arm 35, the spring 32 and the arm 35, therefore, beingdove-tailed together for sliding movement. A set screw37 is threadedinto the enlarge# ment 33 of the spring, the inner extremity of the setscrew bearing against the arm 35 at the base of the recess 34, theconstruction, obviously, being such that the setscrew constitutes ameans for `preventing relative movement between the spring 32 and thearm 35.

set screw 36, threaded into the the bar 45 of the 4key lever, is a post21, into i rying which is inserted a screw'20, adapted to engage with ablock of insulating material 19,

applied to the adjacent side of the portion 45 of the key lever. Mountedin the base 1,

upon the oiposite side of the key lever, is aj dash post "6, into whichis threaded lan` adjusting screw,47.

The transmitter as. above described is connected with a battery asfollows. Referring particularly to Fig. 2, it will be noted that thepost 36 is provided with a reduced shank 40, extended downwardly intothe base 1, the shank 4 0 of the post car; rims bmdmg screw 42, carrylngonef end of a conductor 43. Into the nut 13, a binding post 15 isthreaded, the binding post cara conductor 16. The dash post 46 carriesone end ofv a conductor 48, united with the conductor 43. The operationofthe-device is as follows.

When it is desired to transmit a dot, the

" finger piece 18 of the key lever is moved'in the direction of' thearrow X, tilting the key lever until the contact 30 is brought intobearing against the` contact 31. The circuit, under such' circumstancesis as follows. The current, .traversing the lconass'into the member'45of 22 of the key lever, into the collar' 25, and to the 'spring' 27, thecurrent passing by way of the contacts 30 and 31 into the spr'mg 32,thence into the arm 35, and by i means of the post 36 and the nut 41,into the conductor 43, the circuit obviouslybeing broken when, asshoyvnin Fig. 1 the lever is tilted in the'directon of the-arrow Y until thecontacts 30 and 31 are separated.

In order to 4transmit a dash, the movable end 17 off the` key 4lever isthrown in the direction-ofthearrow' Y, until the end 17 bears againstthe adjusting screw47 in the dash' post 46. Under such circumstances,the circuit'will be 'as follows. From the conductor 16, the current willpass into'the portion 45 of the key lever, thence into the movable end417 of the key le'ver, .to the adjusting screw '47, to the dash post 46,and thence by way of 4the conductor 48, to

the conductor`43. By moving the set screw 37, thespring. 32 maybeadjusted uponxthe arm 35, ,longitudinally of the same, 'the a nut 41,into which is threaded a' is claimed as new and usefu 4the sprin cess toho d the spring in :adjusted ositions.

spring 27 being adjustable in the collar 25,

longitudinally of the -key lever, by manipulating the set screw 28. Therelative posi-` tions of the contacts 30 and 31 may thus be adjusted,and both contacts may likewise be moved' at once, longitudinally of thekey lever. The tension of the spring2 mag7 be y adjusted by means ofthey screw 39, an .means of this "same screw, the space normallyexisting between the contacts30 and 31, may be altered. After the screw39 has been once manipulated, to space the contact points 30 and 31`properly, the spring 32 may be removed and be replaced; again, withoutchanging the space' between the contact points. The screw 20 whichmounted in the post 21, serves as a means .for limiting the tiltingmovement of the key lever, when the same Ais operated in the directionof the arrow X to form' a dot. The Vscrew '47 maybe adjusted in the dashpost 46, so as to limit the movement ofthe end' 17 of the key lever,when the said end is manipulated to transmit a dash.

By reason of the fact that the elements be ng-buz'zing sound caused by;the Vcontact iof the elements 30 and 31, these elements being pressedlirmly together'by the springs 32 and 27, ya split-dot being therefore,an impo'sslbility.

. V32 and 27, are resilient structures, when the key lever is tilted tosend a dot, there will The invention having been set forth, what l is:

1. A transmitter including a key-lever having a contact point, astationary member provided with a laterally extending arm,

having an undercut recess, a spring con- Vforming to and slidably seatedcess the spring-being provided with a con'- 1n' said retact point tocoperate with the first named contact point, and means extended throughto engage the bottom'of the re- 2. -A transmitter including a ey-leverhaving 'aj contact polnt, a stationary element Vand a spring'one ofwhich is dove- `tai1ed into thel other for slidin movement the springbeing provided wit a contact point to coperate with the first namedcontact point, -means extended through the g' means whereby the yieldingaction of the spring -may be regulated. 1

3. A transmitter including a 'rigid arml and a spring dove-tailedtogetherv for slid-l ing movement, in onev of which 'there is anadjustable element to engage the other;

-a keyflever provided with a contact a contact. upon the spring',adapted to engage the e posltion of the contact, point of' the spring,said member constitut an adjusting first named contact; andadjustable'means in the arm, engaging the spring to alter the spacebetween the contacts.

4. A device of the class'described com ris' ing av movable key memberand a xed supporting element; coperating, contactbearng springs slidablymounted upon thekey member and upon the supporting element; an4adjusting device in the sup ort- -ing'elernenib disposed at an acute ange to the spring which said element car'ries and bearing upon saidspring, the adjusting de-

